A Comparatıve Study of Pre-Stressed Rectangular and Trapezoıdal Two and Three Cell Box Gırders usıng Sap2000 Software

Abstract

Now a days traffic is growing every day. Need of underpass and overpass bridges have increased to control the traffic. Bridges are the backbone of nation. Now a days projects are not only finalized on the basis of strength and serviceability but also aesthetically sound. Thus, many types of bridges are constructed these days. Box girders are the elements that can be used in various kind of bridges.

In this work, A comparative study is performed on concrete two and three cell rectangular and trapezoidal prestressed box girder using SAP2000 software. In this study, the analysis for three cell and two cell rectangular and trapezoidal box girders for the various responses like shear force, bending moment, frequency and stiffness at entire girder are performed.

By comparing the box girders, we found that the shear force and moment of three cell rectangular and trapezoidal girders is more than two cell rectangular and trapezoidal girders and the two cell rectangular and trapezoidal box girders have less frequency and stiffness than three cell rectangular and trapezoidal box girders therefore two cell box girders are more effective than three cell girders rectangular and trapezoidal.